Multiple gas burner head



June 2, 1953 c. c. LAMAR 2,640,531

' MULTIPLE GAS BURNER HEAD Filed June 9, 1948 2 Sheets-Sheet l 6%ew/; Clzawm/r J une 2, 1953 c. c. LAMAR MULTIPLE GAS BURNER HEAD Filed June 9, 194a 2 Sheets-Sheet 2 inert 1%- 4 12mm u'ega Patented June 2, 1953 MULTIPLE GAS BURNER HEAD Charles C. Lamar, Chicago, 111., assignor of onefourth to Philip S. Harper and one-fourth to Carolyn L. Harper, both of Chicago, 111., and one-fourth to Harris Trust and Savings Bank, Chicago, Ill., a corporation of Illinois, as trustee for The Philip S. Harper Trust, and one-fourth to said Harris Trust and Savings Bank as trustee for The Carolyn L. Harper Trust Application June 9, 1948, Serial No. 31,960

11 Claims. (Cl. 158-116) The present invention relates to gas burners and has for its primary object the provision of anew and improved double gas burner and parts therefor, including a simmer burner which forms the smaller of the two burner sections of the double gas burner.

Another object of the present invention isto provide a new and improved small diameter gas burner particularly adapted for use as a simmer burner which will distribute a small amount of heat over a large area and provide improved heat distribution and which can be made economically.

Another object of the present invention is the provision of a new and improved simmer burner comprising a relatively narrow peripheral gas escapement slot constituted by two detachable parts separable at the slot whereby the parts can be detached to enable the slot to be cleaned readily.

A further object of the invention is the provision of a new and improved simmer burner comprising a series of generally horizontal gas escapement ports and gas escapement means, which may be a relatively narrow'gas escapement slot,'-located below the ports and directed upwardly so that gas discharged therefrom is directed toward gas discharged from the ports.

Another object of the present invention is to provide a new and improved double gas burner in which simmer burner structure is utilized for holding the main burner cap in place. i

A further object of the present invention is to provide a main burner cap-simmer burner assembly, which can be made and assembled economically.

Another object of the present invention is to provide a new and improved main burner cap' which is adapted to be held in place relative to a main burner base by simmer burner structure. A further object of the present invention is to provide an integral main burner base and simmer burner post which can be constructed economi-' burner and simmer burner post which can beconstructed both readily and economically.

Other objects and advantages of the present" invention will become apparent from the en-' suingdescription of an illustrative embodiment thereof, in the course of which reference is had-- to the accompanying drawings, in which:

- Fig. 1 is a top plan view of a double gas burner constructed in accordance with the present *invention;

Fig. 2 is a'vertical cross sectional view through the burner, taken along the line 22 of Fig. 1; Fig. 3 is an enlarged elevational view of the simmer burner cap; 4

Fig; 4 is a top plan view, partly broken away? of another embodiment of the invention;

Fig. 5 is a vertical cross sectionalview taken along theline 5-5 of Fig. 4;

Fig. 6 is a view similar to Figs. 2 andfr of a further embodiment of the invention; 4

'Fig. 7 isa view similar to Fig. 6 of a still further embodiment of the invention; and

Figs. 8 and 9 are fragmentary-vertical cross sectional views of modified simmer burners: The present invention includes improvements over certain features of burners disclosed andclaimed in the copending application of Philip S. Harper and Vincent 0. Peterson, Serial No. 619,104, filed September 28, 1945, now Patent No: 2,619,164, and assigned to the assignees ofthe present invention. Burners of the character dis-- closed in said application are constructed with a small number of ports supplied with gas at a high rate to provide the heat required to maintain boiling in a normal cooking operation andfrom which heat-is distributed both above and over a wide area radially beyond the burner; which itself is of relatively small diameter, as is desirable with simmer burners. This distribution isespecially advantageous when using cooking utensils having poor heat conductivity. The burners include, in addition, means for positively lighting gas issuing from the various ports, which means includes gas escapement means located between and in proximity to the first mentionedports and supplying a restricted amount of, gas;

for ignition purposes and for improving stability of operation. The present invention; as already indicated, has for one of its obj ects' improvements vention is illustrated as a whole by reference;-

character 10. It includes a mainburner I2 and a simmer burner M, the latter of which is rela' tively small and located centrally of the main burner. 7

able material, such as cast iron. It includesgenerally annular inner and outer walls 20 and 22 rising to the same' level'so that theymay bemachined more expeditiously.- The inner and outer walls are formed integrally with a downwardly extending connection 24 having laterally extending sealing and securing flanges 26, whereby the base can be secured as to the upper end of a mixing tube or venturi, not shown, but which may be of more or less conventional construction.

In accordance with one of the features of the present invention, the main burner base is constructed as an integral unit with the simmer burner post, which is indicated by the reference character 28, and in such manner that all of the top and bottom surfaces are at the same levels, whereby they can be machined expeditiously. From Fig. 2 it can be noted that the upper end of the post is coplanar with the upper edges of main burner base walls 28 and 22 and that its lower end is coplanar with the lower end of the main burner portion 24 and flanges 26. The post is connected by a web 30 to the inner wall of the base. The web may be drilled, as indicated by the reference character 32, to provide an opening for a securing bolt or other means for additionally securing the base and post structure to the main and simmer burner mixing tubes, also not shown. The construction and arrangement of the base and post structure is such that it may be cast as a single unit, thereby simplifying the casting and machining.

The main burner cap l8, in accordance with another feature of the present invention, is adapted detachably to be secured by the simmer burner [4. In order that this may be done, the main burner cap is provided with an apertured central portion 34 connected to the outer portion of the can by a series of radial spoke-like portions 36. The bottom of the central portion and the bottoms of the inner and outer walls 38 and 46 of the burner cap are coplanar and abut against the top of the post 28 and the inner and outer walls 20 and 22, respectively, of the main burner base. These portions may thus also be machined readily and a good contact between the cap and base and post may be obtained. The outer wall 4|] of the main burner cap is provided with a plurality of generally radially extending gas out let or escapement ports 4| which are dimensioned to permit the flow of suficient gas to provide the main burner flame. The top of the cap has an ignition slot 42 for igniting the main burner from the simmer burner.

The simmer burner includes what may be called a cap 44 having a portion adapted to pass through the aperture in the central portion 34 and to abut against it whereby, when the cap is secured to the post, the main burner cap is likewise held in place. Not only is the central portion 34 used in holding the main burner cap in place but, in accordance with another feature of the invention, it isutilized as a portion of the simmer burner.

The simmer burner cap is provided with a central chamber 46 open at its lower end into the burner post 28. A small number of relatively large size ports 48 extend from the chamber to the outer periphery of the cap 44. All the ports 48 are generally radial and in a horizontal plane atapproximately the level of the top of the main burner. The construction is such that a small amount of heat is distributed over a relatively large area radially beyond the simmer burner. The port arrangement is also such that the flame may be turned down to provide a very low heat output without extinction of the flame.

The simmer burner is also provided with means 4 capable of lighting the gas issuing from one of the ports 48 by a flame at another of the ports. This is accomplished by gas 'escapement means including a series of radially and angularly spaced apart ports 50 vertically spaced from the ports 48, preferably downwardly. The ports 50 extend from the central chamber 46 to the outside of an inset portion 52 of the cap located a short distance below the ports 48 and fitting into a recess, sucha counterbore 54, in the central portion 34 of the main burner cap. The inset portion 52 is spaced a short distance from the side wall of the recess, thereby to form a small annular chamber 56 extending around the inset portion and into which chamber gas is discharged through the ports 50. The chamber 56 communicates with the exterior of the burner cap through slot 53 extending generally horizontally and resulting from spacing the cap 44 so that its top extends radially beyond the recess and a short distance above the central portion 34. The slot thus provides a restricted peripheral gas outlet located a short distance below the ports 48. Once the gas is ignited a ribbon flame burns at the slot 58, thereby insuring ignition of the gas escaping from the various ports 48.

The simmer burner cap is secured to the post and also holds the main burner cap in place. The lower end of the burner cap is externally threaded as indicated by the reference character Bi) and the upper end of the post 28 is internally threaded. The arrangement is thus such that both burner caps can be readily secured to as well as detached from the base-post structure. Furthermore, the construction of the simmer burner post as an integral part with the main burner base facilitates manufacture of the posts so that the simmer burner can be located concentrically relative to the main burner cap. In this connection, it may be noted that the portion 62 of the simmer burner cap which is located immediately below the inset portion 52 fits relatively closely in the aperture in the central portion 34 of the main burner cap.

The simmer button of the present invention is also adapted to be manufactured as a simple screw machine part drilled axially to form the burner chamber and having radially drilled ports 48 and 5d. The ports 48 and 50 are located on two diameters and preferably staggered. There are an equal number of them in each series to facilitate indexing in drilling.

In operation, the simmer burner main ports 48, being located on a large diameter and being of greater size, throw the flame outwardly at high velocity for heat distribution. Their large size means that lower resistance is ofiered to the flow of gas and this, together with their relatively small number, gives a low but distributed heat for keeping foods warm without continued cooking. The smaller ports 50 which are located on a smaller diameter of the sirnmer burner do not expel the gas for burning, but rather, the gas flows into the small chamber 56. The gas from chamber 56 flows out through the restricted slot 58 and burns as a ribbon flame. This flame insures ignition from one of the main ports 48 to the other and furnishes a continuous source of igni-- tion for the main ports to prevent flame blowoff with gases of low flame propagation rate. Should the slot 58 become cloggedor it be desired to remove the cap for any other reason, this can be done quite readily. The separated parts can then easily be cleaned and then reassembled.

A number of features of the present invention may be utilized with main burners of other types. For instance, the main burner can be held in place by means other than the simmer burner structure as is the case with the embodiment of the invention illustrated in Figs. 4 and 5. In this embodiment, the main burner cap 18 does not have any central portion whereby it is held inplace but it may be held in place by some other means, such as a bayonet type connection including a fastening element I0 secured to the inner wall 38 of the burner cap and including radially outwardly extending portions adapted to extend underneath lugs or projections 72, which may be formed as a part of or secured to the outer wall 22 of the burner base.

In this embodiment of the invention, the simmer burner I4 includes a burner cap 44 which is constructed identically with the cap 44 previously described. However, instead of being associated with a central portion 34 of the main burner cap,

and the top of the post 28 extended upwardly a slight distance and recessed, as by counterboring, as indicated by reference character BI], to provide the chamber 56 and slot 58, as indicated in Fig. 6.

The invention can also be utilized in conjunction with an integral main burner as illustrated in Fig. '7. Here the main burner 90 is shown as a casting and integral with the simmer burner post 92, to which it is connected by the web 94. The web extends, preferably, downwardly from the parting line 96 of the core. The simmer post is generally vertical and its bottom surface 88 is generally coplanar with the generally horizontal bottom surface I00 of the main burner inlet I02. The top ofthepost is recessed, as by counterboring and as indicated by the reference character 80, to receive the cap 44 and thereby provide chamber 56 and slot 58.

The gas escapement means for lighting gas issuing from the ports 48 may be positioned so as to direct gas towardthe gas issuing from the ports. For example, the gas escapement means may direct the gas generally vertically upward or at an angle toward the gas issuing from the ports 48, as shown in Figs. 8 and 9, respectively. 1 vIn Fig. 8, the simmer burner H0 is shown to include a cap II2 and a bushing I I4, but the top of the simmer burner post could be used in place of the bushing. The cap includes the previously described ports 48 and 5t but the gas escapement means, which is illustrated as a peripheral slot IIB, opens vertically upward so that gas issuing from it flows toward the ports 48 and provides better ignition for gas issuing from the latter. The ports 50 open into a chamber I'IB'defined by a recess formed in the bushing, as by counterboring, and the inset portion of the cap. The slot is formed by extending the top portion iii! of the bushing so that it rises above the bottom of the top-of the cap' and spacing its inner side a short distance from the outside of the top of the cap so that the parallel inner and outer surfaces of the recess and cap provide the vertical slot. In operation, gas is discharged from ports 48 and 50, as inthe previously described embodiments, but the gas from the chamber H8 is directed generally vertically upward toward the gas issuing from ports 48. In the embodiment of Fig. 9, the gas escapement means is inclined but still directs gas toward the gas issuing from ports 48. v

The simmer burner is indicated as a wholeby the reference character I30. It includes a cap I32 and a bushing I34, but, as in the case of the embodiment of Fig. 8, the simmer burner post could be utilized in place of the bushing. The cap includes the ports 48 and 50 but the gas escapement means, which is illustrated as a peripheral slot I36, is inclined upwardly and outwardly so that gas issuing from it flows toward; gas issuing from ports 48. The ports 50 open into a slot I38 defined by a countersunk recess in the bushing and an inset portion of the cap. The cap and bushing have parallel spaced apart inclined surfaces I40 and I42 defining-the slot I36. In operation, gas is discharged from the ports 48 and 50 and the gas from the chamber I 36 is directed upwardly and outwardly toward the gas issuing from ports 48.

While the present invention has been described in detail in conjunction with illustrative embodi ments thereof, it should be understood that these details are not intended to be limitative of the. invention except in so far as set forth in the accompanying claims. Y

Having thus described my invention, what I claim as new and desire to secure. by Letters Patent of the United Statesis:

l. A gas burner including a unitary structure having a central internal chamber and a plurality of angularly spaced apart generally radial ports distributed generally uniformly around the burner in a generally horizontal plane and communicating with said chamber, said ports being of a size to produce jets of flame extending a substantial distance beyond the outer periphery of the burner, and said structure comprising gas escapement means located between and in proximity to said ports including angularly'spaced apart port communicating with said chamber and located in a generally horizontal plane spaced from and located below said first mentioned plane, an annular chamber located below said first mentioned plane into which said second mentioned ports discharge and means forming a peripherally open annular slot communicating with said annular chamber, said slot being located below and in ignition relationship to said first mentioned ports and opening in a direction in the range between the vertically upward and horizontally outward.

2. A gas burner structure including an upper cylindrical portion having a central internal chamber and a first series of angularly spaced apart generally radial ports distributed generally uniformly around said portion in a generally horizontal plane and communicating with said chamber, said ports being of a size to produce jets of flame extending a substantial distance said lower portion to said chamber, said smaller" ports being of a size to supply a smaller quantity of gas to maintain-ignition at said first mentioned port, and said structure including a second inset cylindrical portion located below said first inset portion and an externally threaded bottom portion, integral with the two first mentioned portions, and the two inset portions being connected by an annular plane seating surface.

3. A double gas burner assembly including structure defining a main burner base, a main burner cap on said base having a series of gas outlet ports at its outer periphery, said cap having a central portion with a counterbored aperture, and means including a simmer burner cap having a series of generally radially directed gas outlet ports and an inset lower portion passing through the apertured central portion and abutting against said central portion for holding said main burner cap relative to said base, said inset portion having a smaller diameter than the counterbore thereby to define an annular chamber with the central portion of said main burner cap, said inset portion having a series of ports opening into said chamber, and said simmer burner cap extending over but spaced from the apertured central portion of said main burner cap thereby to define an annular slot.

4. A double gas burner assembly including structure defining a main burner base having inner and outer walls rising to the same level, a main burner cap having inner and outer wall structure abutting against the base walls thereby to form a burner chamber, a central hollow simmer burner post rising to the level of said base walls and having integral securing means on its inner wall at but below its upper end, said cap having a central apertured portion abutting against said post, and means including simmer burner structure having a tubular portion extending through the aperture in the main burner cap and abutting against said central portion and having integral securing means on the outer wall of said tubular portion cooperating with said securing means on the inner'wall of said post for outer peripheral portion spaced a short distance from the adjacent side wall of the counterbore to define an annular chamber and an outwardly extending part spaced a short distance above the central portion of said main burner cap and cooperating with said central portion of said main burner cap to define a peripheral gas escapement slot communicating with said chamber, said simmer burner having a series of radial gas outlet ports located above the central part of the main burner cap and another series of gas outlet ports leading into said central chamber.

6. An integral double gas burner base including structure defining annular main burner inner and outer walls and a base securing and gas inlet defining portion and a hollow gas inlet defining simmer burner post located centrally of said walls and connected by a web to said structure, said securing portion extending outwardly to one side from the outer wall of the main burner and forming a gas supply inlet for the main burner, said post and walls rising to the same level above the securing portion and said post and securing portion having coplanar bottom surfaces located below the main burner walls.

7. A gas burner structure including a firstelement having an upper portion of predetermined diameter having a central internal chamber and a series of angularly spaced apart generally radial outwardly directed ports distributed generally uniformly around said portion in a generally horizontal planeand communicating with said chamber, said ports being of a size to produce jets of flame extending a substantial distance beyond the outer periphery of said portion, a lower inset portion located a short distance below said ports and a second series of ports extending through said inset portion into said chamber, and a second element having a portion engaging said first element below said second series of ports, an intermediate portion spaced from the inset portion in the region of said second series of ports thereby to define an annular chamber into which said second series of ports open, and a top portion spaced from the upper portion of said first element in a region below and in ignition relationship to said first mentioned ports thereby to define an ignition slot in ignition relationship to said first mentioned ports, and means detachably securing the first element to the second whereby the first element is separable from the second at the slot so as to enable the slot readily to be cleaned.

8. A gas burner including separable upper and lower burner defining elements, the upper of said elements having a series of angularly spaced apart generally radial outwardly directed gas ischarge ports, readily detachable means for detachably securing said elements whereby they can be separated, said elements having adjacent surfaces located at the line of separation of said elements and with outer portions at the exterior of said elements spaced from each other so as to define a, narrow continuous slot around the outside of the burner, said surfaces also being located below and in proximity to said radial ports so that said slot constitutes an ignition slot below ignition relationship to said ports for igniting gas issuing from said ports, said surfaces being also so located that said slot opens in a direction in the range between the vertically upward and horizontally outward, and means including a gas supply chamber communicating with said ports and slot for supplying gas to said ports and to said slot.

9. A gas burner as claimed in claim 8 wherein said slot defining surface portions are in horizcntal planes and define a horizontally outwardly facing ignition slot.

19. A gas burner as claimed in claim 8 wherein said slot defining surface portions are in vertical planes and define a vertically upwardly facing ignition slot.

11. A gas burner including structure having a generally annular portion with a central aperture therein and a central counterbore at its upper side to define a bottom wall and a side wall at the upper end of the aperture, a burner cap mounted on said annular portion, said cap having a central internal gas chamber and a plu-' rality of angularly spaced apart generally horizontal radially disposed gas discharge ports distributed generally uniformly around the cap and communicating with said chamber, said ports being of a size t produce jets of flame extending a substantial distance beyond the outer periphery of the cap, said cap having a first inset portion extending downwardly into the counterbore from a location close to said ports and a second inset portion extending into the central aperture, the two inset portions being connected by an annular surface seating on the bottom Wall of the counterbore, the first inset portion being spaced inwardly from the vertical wall of the counterbore to define an annular chamber, and the lower part of the cap being spaced from said annular portion to define a narrow annular ignition slot below and in ignition relation with the ports in the cap, and a, plurality of gas ports extending through the cap in the region of the first inset portion connecting the internal chamber in the cap and the annular chamber for supplying gas to the latter for discharge through said slot.

CHARLES C. LAMAR.

References Cited in the file of this patent UNITED STATES PATENTS Number Number 

